Open AccessA photometric study of the contact binaries V523 Cas and TY UMa
Author(s) -
Lister T. A.,
McDermid R. M.,
Hilditch R. W.
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03552.x
Subject(s) - physics , photometry (optics) , light curve , photoelectric effect , astrophysics , contact binary , astronomy , astrometry , eclipse , binary star , optics , stars
Broad‐band V and I photometry of the short‐period W UMa‐type contact binaries V523 Cas and TY UMa are reported. From the light curves, the system parameters have been determined and evidence is presented for extensive spot activity in both systems, with V523 Cas being the more active system. A compilation of all the available photoelectric and CCD‐based timings of eclipse minima is made; the O–C diagrams show evidence for an increasing period in the case of V523 Cas and a decreasing period in TY UMa. In addition we derive a more accurate astrometric position for V523 Cas from our CCD images.